Device for separately supplying coarse grain and fine grain material to a container such that the material is uniformly distributed in the container



DIETER SCHILLING ET 3,532,325 ATELY SUPPLYING COARSE GRAIN AND FINE ATTHE MATERIAL NIFORMLY DISTRIBUTED IN THE CON Oct. 6, 1970 HANS- DEVICEFOR SEPAR GRAIN MATERIAL TO A CONTAINER SUCH TH IS U TAINER Filed July22, 1968 3 Sheefs-.-Sheet 1 3,532,326 R SEPARATELY SUFPLYING COARSEGRAIN AND. FINE Oct. "6, 1970 HANS-DIETER SCHILLING ETAL DEVICE F0 GRAINMATERIAL TO A CONTAINER SUCH THAT THE MATERIAL IS UNIFORMLY DISTRIBUTEDIN THE CONTAINER Filed July 22, 1968 3 Shets-$heet 2 3,532,326 COARSEGRAIN AND FINE I ucn THAT THE MATERIAL Oct. 6, 1970 HANS'DIETERSCHILLING ETAL DEVICE FOR SEPARATELY SUPPLYING GRAIN MATERIAL TO ACONTAINER S IS UNIFORMLY DISTRIBUTED IN THE CONTAINER Filed July 22,1968 Sheets-Sheet 5 United States Patent US. Cl. 259-18 8 ClaimsABSTRACT OF THE DISCLOSURE A distributor device in which two verticalconcentric pipes respectively supply fine grain and coarse grainmaterial, the pipes projecting into a container and supplying thematerial therein through the center of the inner pipe and the annulargap between the pipes such that the distribution of the material in thecontainer is uniform. In order to feed material to the outer pipe aninclined chute opens thereinto and distributor may :be placed in theouter pipe to insure uniform feed of material into the outer pipe. Thedistributor is in the form of a triangular plate having one edgeattached to the inner surface of the outer pipe at the lower edge of thechute outlet and two vertical blades are disposed on the edges of theplate proximate the a chute outlet.

BRIEF SUMMARY OF THE INVENTION The present invention relates to a devicefor feeding a container, especially a bunker, a silo or a reactor withdifferent size materials through a separate coarse material feed pipeand a fine material feed pipe to ensure even distribution of thematerials over the cross-sectional area of the container.

A great number of devices are known for uniformly feeding containerswith a solid material, the most com mon being displaceable feedingconveyors, rotating and swivelling transversal belts or pivoteddistributing pipes. Also known are shovel loader type distributors, diskfeeders, and distributing cones, both rotating or nonrotating. All ofthe known devices, however, are handicapped *by the disadvantage thatthey employ rotating and/or swivelling components which must be moved bydriving mechanisms.

An object of the present invention is to provide a feeding device whichoperates without mechanically movable components and which utilizes onlythe gravity of the material being discharged and the conical shape ofthe feed pile to effect even distribution of the material.

According to the invention, this object is achieved by disposing in asubstantially vertical position two concentric feeding pipes projectinginto the container, the inner pipe being surrounded by the outer pipe.In the feeding device according to the invention it does not make anydifference whether the finer or coarser material is discharged throughthe outer or the inner pipe. In every case, the outlet of the outer and/or the inner pipe can be formed by an annular gap the size of which canbe adjusted to the desired flow quantity.

In one embodiment the size of the annular gap may be adjusted by aregulable iris diaphragm.

Furthermore, a chute may be fixed to the outer pipe for the supply ofthe material, preferably coarse-grained material.

In order to obtain a uniform, statistical distribution of 3,532,325Patented Oct. 6, 1970 coarse material within fine grained material inthe column of bulk material in the container, it has been foundimportant to provide an even distribution in the annular space betweenthe inner and outer pipes. This objective is achieved by furnishing thepipes with suitable dimensions. It has been shown to be particularlyadvantageous if the ratio between the width of the chute and the outerdiameter of the inner pipe is 3 to 2. and if the width of the annularspace is 2 to 4 times the mean size of the coarse material.

If the annular space is greater, it is contemplated according to theinvention to provide a distributor in the form of a triangular insert inthe annular space, said insert being disposed at an angle of 45 inrelation to the hori zontal and its upper corner being fixed to theouter pipe at the lower end of the outlet of the delivery chute. Thetriangular insert is a plate and is shaped such that its horizontalprojection forms an equilateral triangle, of which the corners are cutoff.

To further improve the regular distribution of coarse material in thefine-grained material, the distributor further comprises two narrowblades fixed to two sides of the triangle adjacent the outlet of thedelivery chute, to divide the coarse material upon its arrival on theplate into three streams of equal size. Moreover, a crescent-shapedopening is formed between the inner pipe and the bore through which itpasses in the plate on the side of the chute.

The feeding device according to this invention will now be described inmore detail with reference to the enclosed drawing which is onlyintended to show schematically and by way of example several embodimentsof the invention.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side elevation view insection of a feed device for coarse and fine grain material;

FIG. 2 shows another embodiment of such a feed device;

FIG. 3 shows a third embodiment of a feed device; and

FIG. 4 is a plan view of the device in FIG. 3.

DETAILED DESCRIPTION In FIG. 1 there is shown a device in accordancewith the invention which comprises an inner pipe 1 for the coarse grainmaterial and an outer pipe 2 surrounding the first pipe in spacedrelation to define an annular gap 3 therebetween. The fine-grainedmaterial is discharged through the annular gap. The quantity of feedmaterial to be discharged is controlled by the size of the annular gap 3at the lower end or by an iris diaphragm which may be disposed thereat.The fine-grained material is supplied from storage bin 9 and dischargedinto a container 10, which may be a bunker, reactor, silo or the like tobe filled. A cylindrical curtain 11 of fine-grained material pours downand forms a conical pile 12 with a cratershaped top. The coarse grainmaterial which is surrounded by the curtain of fine-grained material isdropped into the crater and many particles of coarse-grain materialforce their way through the curtain and are distributed in alldirections into the mass of fine-grain material. In doing so thecoarse-grain material will not roll down the flank of the cone towardsthe walls of the container, but is encircled by the current of thefine-grained material so as to rest in the cone in a statisticaldistribution.

In FIG. 2 the feeding device comprises an inner pipe 1a in the center ofthe container 10 to supply fine-grained material from the storage bin9a, the coarse material being discharged through a chute 4 into theannular space between the inner pipe 1a and the outer pipe 2a; in thiscase the width of the annulus is considerably greater than the diameterof the inner pipe 1a. The blended mixture of the coarse and fine grainmaterial is drawn 01f at the bottom of the container 10 such that thecolumn of bulk material descends evenly as, for example, in a shaftfurnace for the carbonization of coal briquettes by means of solid heatcarriers. As the inner pipe 1a is in contact with the conical pile 12,the column of finegrained material will build up in the inner pile andrise up to the storage bin 9a so as to form a gas-tight lock between thebin 9a and the container 10. The flow of the fine-grained feedautomatically follows the descent of the blended material in the shaft.

In order to gain uniform distribution of the coarsegrain material in thefine-grain material, the chute 4 should have a diameter which is in theratio of 3 :2 compared to the diameter of inner pipe 1a; and the widthof annular gap 3 is between two and four times the mean size of thecoarse material.

FIG. 3 shows an arrangement in which a distributor is placed at theoutlet of chute 4 to divide the incoming feed of coarse material into aplurality of streams thereby to insure uniformity of deposit of coarsematerial across the entire cross-section of the outer pipe 2a. Thedistributor comprises a triangular plate 5 disposed at an angle of about45 from the horizontal. The plate 5 is attached to the outer pipe 2a insuch a way that the upper corner of the triangular insert 5 is fixed atthe discharge end 6 of the delivery chute 4.

In order to divide the stream of the material, two vertical, narrowblades 7 are fixed to the two sides of the triangle adjacent dischargeend 6, and the bore in the plate 5 for passage of the inner pipe in isenlarged on the ascending side of the plate towards the discharge end 6by a crescent-shaped recess 8, the maximum width of which ranges from1.5 to 2.5 times the mean diameter of the coarse feed material. Thearrows in FIG. 4 show the path of travel of the material over the plate5.

As a consequence of this path of travel of the coarse feed material, thedistribution of the feed of coarse material over the cross-section ofthe outer pipe 2a is substantially uniform at its lower end.

What is claimed is:

1. A device for simultaneously feeding a container with different gradematerials to obtain uniform distribution of the materials over thecross-sectional area of the container, said device comprising twoseparate feeding pipes projecting into a container and disposedconcentrically in a substantially vertical position, the outer pipeforming an annular gap with the inner pipe, one pipe being coupled to asupply of relatively coarse material, the other pipe being coupled to asupply of relatively fine material, a chute for delivery of material tothe outer pipe, said chute being inclined with the horizontal and havingan outlet which opens into the outer pipe, and distributor means in saidouter pipe at said outlet of the chute to provide uniform distributionof the feed of the material into said outer pipe.

2. A device according to claim 1 comprising means in said gap at thelower end thereof for varying the size thereat.

3. A device according to claim 1, wherein said chute is inclined at anangle of 45.

4. A device as claimed in claim 1, wherein said distributor meanscomprises an inclined triangular plate adjacent the lower end of thechute outlet.

5. A device as claimed in claim 4, wherein said triangular plate hasapex portions respectively adjacent the inner surface of the outerplate, one of said apex portions being at the lower end of the chuteoutlet.

6. A device as claimed in claim 5, wherein said distributor meansfurther comprises a pair of upright blades on the edges of said plateproximate the chute outlet.

7. A device as claimed in claim 6, wherein said plate has a bore for thepassage of said inner pipe, said bore being enlarged on the side facingthe chute outlet to form a crescent shape opening with said inner pipe.

8. A device as claimed in claim 7, wherein said crescent-shaped openinghas a maximum width which is between 1.5 and 2.5 times the mean diameterof the feed material supplied to the chute.

References Cited UNITED STATES PATENTS 2,138,172 11/1938 Johnson259--150 X 3,091,369 5/1963 Sackett 259-450 X ROBERT W. JENKINS, PrimaryExaminer US. Cl. X.R. 259l80

